1. (2014•南京四校阶段调研)—don’t press the button，john. —what if i________？ a．did b．would c．will d．shall 2.-mary, would you like to come to my birthday party? -_____. a. of course, you could b. sure. go ahead c. sorry, you may not d. no, you mustn’t 3.—it’s difficult to tell this picture from that one.
